7916989 has 4 divisors (see below), whose sum is σ = 7922656. Its totient is φ = 7911324.

The previous prime is 7916963. The next prime is 7917011. The reversal of 7916989 is 9896197.

7916989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9896197 = 467 ⋅21191.

It is a cyclic number.

It is not a de Polignac number, because 7916989 - 2⁵ = 7916957 is a prime.

It is a super-2 number, since 2×7916989² = 125357429652242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7916929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922 + ... + 4084.

It is an arithmetic number, because the mean of its divisors is an integer number (1980664).

Almost surely, 2^7916989 is an apocalyptic number.

It is an amenable number.

7916989 is a deficient number, since it is larger than the sum of its proper divisors (5667).

7916989 is a wasteful number, since it uses less digits than its factorization.

7916989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5666.

The product of its digits is 244944, while the sum is 49.

The square root of 7916989 is about 2813.7144489091. The cubic root of 7916989 is about 199.3058351298.

The spelling of 7916989 in words is "seven million, nine hundred sixteen thousand, nine hundred eighty-nine".